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Photo: Alastair Pike/AFP via Getty

Hackers who infiltrated government networks in the SolarWinds cyberattack compromised "dozens of email accounts" in the Treasury, Senate Finance Committee Ranking Member Ron Wyden (D-Ore.) said Monday.

Why it matters: The monthslong cyberattack impacted a range of companies and government agencies and has prompted outrage in Washington D.C. as officials try to get to the bottom of what happened. The Treasury has not yet been able to ascertain what information, if any, was stolen, per Wyden.

The big picture: The breach that began in July "appears to be significant," Wyden said in an emailed statement. Perpetrators broke into systems in the Departmental Offices division of Treasury, which comprises the department’s highest-ranking officials, according to Wyden.

  • There is no evidence the hack impacted the IRS or taxpayer data, but the “full depth” of the attack is not known.
  • "Finally, after years of government officials advocating for encryption backdoors, and ignoring warnings from cybersecurity experts who said that that encryption keys become irresistible targets for hackers, the USG has now suffered a breach that seems to involve skilled hackers stealing encryption keys from USG servers," Wyden said.

Of note: Treasury Secretary Steven Mnuchin told CNBC, "The good news is there's been no damage, nor have we seen any large amounts of information displaced."

  • The Treasury is working with the National Security Council and Intel agencies to address the breach, Mnuchin said.
  • The Treasury did not immediately respond to Axios' request for comment.

Go deeper

Russia’s SolarWinds hackers likely burrowed deep

Illustration: Eniola Odetunde/Axios

Russian cyber operators are almost certainly still rummaging through U.S. networks, potentially lifting data or setting traps for future havoc even as officials scramble to assess the damage Moscow's hack has already dealt.

Why it matters: The hack, powered by malicious code inserted into an update of SolarWinds network management software, could be among the most significant in the country’s history, perhaps on par with China’s hack of the Office of Personnel Management or Russia’s 2014 hack of the State Department.

1 hour ago - Sports

Simone Biles is still a winner

Photo: Laurence Griffiths/Getty Images

Simone Biles' leadership on the mat has never been questioned. After her shocking withdrawal from Tuesday's team final, she proved just as capable a leader off of it.

What happened: During the first rotation, Biles performed an uncharacteristically bad vault, appearing to lose herself in midair.

The "remarkable" business investment recovery

Data: U.S. Census Bureau; Chart: Axios Visuals

Businesses are investing in themselves.

Why it matters: Core capital goods orders, or those for durable goods that aren’t aircraft or defense-related, are a proxy for business investment.